EP0214978A1 - Procede de realisation de revetements de carbures de bore et revetements obtenus. - Google Patents
Procede de realisation de revetements de carbures de bore et revetements obtenus.Info
- Publication number
- EP0214978A1 EP0214978A1 EP85902568A EP85902568A EP0214978A1 EP 0214978 A1 EP0214978 A1 EP 0214978A1 EP 85902568 A EP85902568 A EP 85902568A EP 85902568 A EP85902568 A EP 85902568A EP 0214978 A1 EP0214978 A1 EP 0214978A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- boron
- coating
- hardness
- carbide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910052796 boron Inorganic materials 0.000 title claims description 14
- -1 boron carbides Chemical class 0.000 title description 7
- 239000000758 substrate Substances 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 33
- 239000011248 coating agent Substances 0.000 claims abstract description 27
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 17
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000008246 gaseous mixture Substances 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 150000001639 boron compounds Chemical group 0.000 claims abstract description 6
- 150000001722 carbon compounds Chemical class 0.000 claims abstract description 4
- 238000000151 deposition Methods 0.000 claims description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 230000008021 deposition Effects 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 7
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 7
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 claims description 6
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 230000004907 flux Effects 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000010586 diagram Methods 0.000 claims description 3
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 239000002244 precipitate Substances 0.000 claims 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 20
- 238000005553 drilling Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 6
- 239000010941 cobalt Substances 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 239000008188 pellet Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000012808 vapor phase Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 241000331231 Amorphocerini gen. n. 1 DAD-2008 Species 0.000 description 1
- 241000334993 Parma Species 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- PPWPWBNSKBDSPK-UHFFFAOYSA-N [B].[C] Chemical compound [B].[C] PPWPWBNSKBDSPK-UHFFFAOYSA-N 0.000 description 1
- WRSVIZQEENMKOC-UHFFFAOYSA-N [B].[Co].[Co].[Co] Chemical compound [B].[Co].[Co].[Co] WRSVIZQEENMKOC-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910021398 atomic carbon Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 1
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000006115 industrial coating Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 101150006061 neur gene Proteins 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
Definitions
- the invention relates to a method for producing boron carbide coatings on the surface of a substrate; it extends to the coatings obtained.
- the invention is particularly applicable for obtaining cutting or wearing parts that benefit from excellent hardness and abrasion and erosion resistance properties.
- the deposition is carried out at high gas flow (greater than 1.10 -3 g. Cm -2 s - 1 ) most often at atmospheric pressure and at high temperature; their goal is a study of the boron-carbon system or the preparation of boron carbide with a composition close to B 4 C.
- the present invention aims to provide a new coating of boron carbides on solid substrate, the hardness of which is significantly greater than that of known industrial coatings and between approximately 3,200 and 5,100 kg / mm2 (Knoop micro-hardness determined by "OLP" micro-durometer equipped with a Knoop pyramid under a load of 100 g; thereafter, reference will always be made to this definition of hardness which will be noted HK 0, 1 ).
- An essential objective of the invention is to allow a precise adjustment of the hardness of the coating in this range according to the application envisaged, so as to obtain the best compromise hardness / resilience for this application.
- the method of the invention consists in depositing on the surface of the substrate one of the crystalline phases or a mixture of the following crystalline phases: phase of quadratic structure (8 50 C 2 ), phase of rhombohedral structure (B 1 3 C 2 ).
- Such a deposit has a hardness HK 0, 1 , comprised in a range extending between 3,200 and 5,100 kg / mm2.
- the atomic ratio C / 8 of the deposit is adjusted in a range from 0.04 to 0.22 to an increasing function value of the desired hardness.
- the process is preferably carried out by chemical vapor deposition, consisting in reducing a gaseous mixture containing at least one boron compound, in particular ment of boron trichlorue, and at least one carbon compound, in particular methane; it is characterized by the following conditions which determine the appearance of the above-mentioned crystalline phases:
- the surface of the substrate is heated to a temperature of between 800 and 1,200 ° C.
- the gas mixture is caused to sweep the surface of the substrate with an average mass flow in a range between 10 -4 and 10 -3 g. cm -2 .s -1 ,
- the total pressure of the gas mixture is adjusted to a value less than or equal to 100 millibars
- the composition of the gaseous mixture of boron compound and carbon compound is adjusted so that the C / B atomic ratio of carbon and boron present in the gaseous mixture is between approximately 0.05 and 6.
- the reaction is carried out in the presence of hydrogen in an amount necessary to ensure the reduction; the atomic ratio C / B is adjusted to the appropriate value in the aforementioned range, according to the desired hardness, by adjusting the methane flow rate De and the boron trichloride flow rate Db.
- the ratio R is adjusted to a value between 5 and 85, fonc increasing the desired hardness.
- a variation in the ratio R concerning the gas flow rates of the initial mixture makes it possible to vary, on the one hand, the composition of these phases, on the other hand, their relative proportion; the hardness of the coating obtained depends on these compositions and proportions and can therefore be adjusted by the operator.
- FIG. 1 is a diagram giving the hardness HK 0, 1 of the coatings obtained as a function of the atomic ratio C / B thereof,
- the hardness of the deposit formed by one or other of the above-mentioned crystalline phases or by their mixture is an increasing function of the carbon content of this deposit.
- This ratio R is the essential parameter which defines the nature, the propor tion and the composition of the phases and, consequently, the mechanical properties of the deposit.
- FIG. 2 illustrates the results obtained for implementation at a temperature of 1,125 ° C; this curve moves with the temperature and will therefore be experimentally plotted in each application as a function of the temperature chosen to carry out the deposition.
- the coating obtained consists of the rhombohedral phase of variable composition B 13 C 2 ).
- the deposition can be carried out on any substrate suitable for the application, which is able to withstand the processing temperature; it should be noted that the processing temperature range (300 ° C - 1200 ° C) makes it possible to coat substrates such as tungsten carbide or steels without irreversibly affecting their structure.
- the deposit can be made directly on the substrate or with the interposition of a diffusion barrier on the surface thereof.
- This barrier constituted in particular by titanium carbide, titanium nitride, silicon carbide, ... eliminates the chemical or physico-chemical interactions between the substrate and the coating.
- the coating is then produced with a thickness allowing it to have sufficient clean mechanical strength (thickness greater than 100 microns); after deposition, the coating is separated from the substrate in order to obtain the desired solid part dream.
- the substrate will preferably be chosen so as to develop a weak adhesion with the coating (graphite, boron nitride); the separation can be carried out by chemical or mechanical destruction of the substrate, in particular in the case of hollow parts.
- T 1020 ° C
- P T 1 0 mbar
- the boron originating from the reaction diffuses into the substrate and forms a sublayer of cobalt boride (B Co) which surrounds the grains of tungsten carbide.
- B Co cobalt boride
- the thickness of this intermediate sublayer between the coating proper and the substrate varies with the duration of treatment and the cobalt content of the substrate.
- the hardness of this sublayer is intermediate between that of the substrate and that of the coating, in the example of the order of 1,430 kg / mm 2 .
- the layer of boron carbides which develops above is dense (very low porosity rate) and macroscopically homogeneous.
- the interface between the coating and the underlay consists of a layer of pure BCo, 1 to 2 ⁇ m thick.
- the morphology of the underlay depends on the te neur in Co of the substrate. Cobalt indeed diffuses towards the surface creating numerous porosities by Kirkendal effect in the case of high contents (30%). The porosities attenuate or even disappear in the case of low cobalt contents of the substrate (15%).
- RX X-ray diffraction
- TiC titanium carbide
- Thickness of the deposit 30 ⁇ m
- Example 5 which follows gives the comparative results of drilling tests with bare substrates and coated substrates according to the method of the invention.
- test conditions were as follows:
- the drilling was stopped in the case of uncoated pellets when the advancement speed was less than 5 cm / min. In the case of pellets coated with boron carbide, drilling was stopped when the advancement speed was less than 8 cm / min, that is to say when the coating was worn and which could be considered that drilling was done with the sole substrate.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Vapour Deposition (AREA)
- Carbon And Carbon Compounds (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Adornments (AREA)
- Ceramic Products (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85902568T ATE38691T1 (de) | 1984-06-27 | 1985-06-03 | Verfahren zur herstellung von ueberzuegen aus borkarbiden und die durch dieses verfahren hergestellten ueberzuege. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8410290A FR2566806B1 (fr) | 1984-06-27 | 1984-06-27 | Procede de realisation de revetements de carbures de bore et revetements obtenus |
FR8410290 | 1984-06-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0214978A1 true EP0214978A1 (fr) | 1987-03-25 |
EP0214978B1 EP0214978B1 (fr) | 1988-11-17 |
Family
ID=9305589
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85902568A Expired EP0214978B1 (fr) | 1984-06-27 | 1985-06-03 | Procede de realisation de revetements de carbures de bore et revetements obtenus |
Country Status (13)
Country | Link |
---|---|
US (1) | US4942062A (fr) |
EP (1) | EP0214978B1 (fr) |
JP (1) | JPH068508B2 (fr) |
KR (1) | KR920009842B1 (fr) |
AT (1) | ATE38691T1 (fr) |
AU (1) | AU596074B2 (fr) |
BR (1) | BR8507204A (fr) |
DE (1) | DE3566275D1 (fr) |
DK (1) | DK166785B1 (fr) |
FR (1) | FR2566806B1 (fr) |
NO (1) | NO168779C (fr) |
WO (1) | WO1986000345A1 (fr) |
ZA (1) | ZA854830B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0179582A2 (fr) * | 1984-10-09 | 1986-04-30 | Energy Conversion Devices, Inc. | Revêtement multicouche dont la couche superficielle contient du bore et du carbone en désordre et résistant à la corrosion |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU625072B2 (en) * | 1988-07-13 | 1992-07-02 | Warner-Lambert Company | Shaving razors |
JPH0649915A (ja) * | 1992-07-28 | 1994-02-22 | Yoshikatsu Yoshida | 防虫用介装材 |
GB2308133B (en) * | 1995-12-13 | 2000-06-21 | Kennametal Inc | Cutting tool for machining titanium and titanium alloys |
US5984593A (en) * | 1997-03-12 | 1999-11-16 | Kennametal Inc. | Cutting insert for milling titanium and titanium alloys |
KR101361814B1 (ko) * | 2012-03-30 | 2014-02-12 | 한국과학기술연구원 | 팩세멘테이션 공정을 이용한 철계 금속 표면의 코발트 붕화물 코팅층 형성 방법 |
CN107405877A (zh) | 2015-01-22 | 2017-11-28 | 犹他大学研究基金会 | 功能梯度碳化物 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3537877A (en) * | 1966-09-28 | 1970-11-03 | Gen Electric | Low temperature method for producing amorphous boron-carbon deposits |
FR2136978B1 (fr) * | 1971-05-11 | 1973-05-11 | France Etat | |
US3799830A (en) * | 1972-01-12 | 1974-03-26 | Nat Res Corp | Method of producing boron carbide film laminates |
US4045597A (en) * | 1972-03-01 | 1977-08-30 | Avco Corporation | Process for modifying amorphous carbon filaments |
US3967029A (en) * | 1973-03-02 | 1976-06-29 | United Technologies Corporation | Boron-carbon alloy tape |
US4225355A (en) * | 1979-02-16 | 1980-09-30 | United Technologies Corporation | Amorphous boron-carbon alloy in bulk form and methods of making the same |
US4287259A (en) * | 1979-12-05 | 1981-09-01 | The United States Of America As Represented By The United States Department Of Energy | Preparation and uses of amorphous boron carbide coated substrates |
DE3246361A1 (de) * | 1982-02-27 | 1983-09-08 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Kohlenstoff enthaltende gleitschicht |
US4540596A (en) * | 1983-05-06 | 1985-09-10 | Smith International, Inc. | Method of producing thin, hard coating |
-
1984
- 1984-06-27 FR FR8410290A patent/FR2566806B1/fr not_active Expired
-
1985
- 1985-06-03 US US06/851,080 patent/US4942062A/en not_active Expired - Fee Related
- 1985-06-03 KR KR1019860700108A patent/KR920009842B1/ko not_active IP Right Cessation
- 1985-06-03 WO PCT/FR1985/000136 patent/WO1986000345A1/fr active IP Right Grant
- 1985-06-03 AT AT85902568T patent/ATE38691T1/de not_active IP Right Cessation
- 1985-06-03 JP JP60502477A patent/JPH068508B2/ja not_active Expired - Lifetime
- 1985-06-03 DE DE8585902568T patent/DE3566275D1/de not_active Expired
- 1985-06-03 EP EP85902568A patent/EP0214978B1/fr not_active Expired
- 1985-06-03 BR BR8507204A patent/BR8507204A/pt not_active IP Right Cessation
- 1985-06-03 AU AU44062/85A patent/AU596074B2/en not_active Ceased
- 1985-06-26 ZA ZA854830A patent/ZA854830B/xx unknown
-
1986
- 1986-02-19 NO NO86860622A patent/NO168779C/no unknown
- 1986-02-26 DK DK088786A patent/DK166785B1/da active
Non-Patent Citations (1)
Title |
---|
See references of WO8600345A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0179582A2 (fr) * | 1984-10-09 | 1986-04-30 | Energy Conversion Devices, Inc. | Revêtement multicouche dont la couche superficielle contient du bore et du carbone en désordre et résistant à la corrosion |
EP0179582B1 (fr) * | 1984-10-09 | 1989-12-27 | Energy Conversion Devices, Inc. | Revêtement multicouche dont la couche superficielle contient du bore et du carbone en désordre et résistant à la corrosion |
Also Published As
Publication number | Publication date |
---|---|
BR8507204A (pt) | 1987-08-04 |
DK88786A (da) | 1986-02-26 |
WO1986000345A1 (fr) | 1986-01-16 |
JPS61502617A (ja) | 1986-11-13 |
KR920009842B1 (ko) | 1992-10-31 |
NO860622L (no) | 1986-02-19 |
DE3566275D1 (en) | 1988-12-22 |
EP0214978B1 (fr) | 1988-11-17 |
AU4406285A (en) | 1986-01-24 |
FR2566806A1 (fr) | 1986-01-03 |
NO168779B (no) | 1991-12-23 |
JPH068508B2 (ja) | 1994-02-02 |
AU596074B2 (en) | 1990-04-26 |
NO168779C (no) | 1992-04-01 |
ATE38691T1 (de) | 1988-12-15 |
ZA854830B (en) | 1986-02-26 |
DK166785B1 (da) | 1993-07-12 |
KR860700270A (ko) | 1986-08-01 |
US4942062A (en) | 1990-07-17 |
FR2566806B1 (fr) | 1986-12-05 |
DK88786D0 (da) | 1986-02-26 |
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